It's not just you: Twitter and TweetDeck are experiencing an outage

What you need to know

Twitter is experiencing API irregularity, which is affecting all of its services.
Reports of problems in-browser and on TweetDeck.
The issue is also affecting Twitter on Android.

Twitter is experiencing irregularities with its APIs, which is affecting all of its services this morning.

We've been experiencing outages across Twitter and TweetDeck. You might have had trouble Tweeting, getting notifications, or viewing DMs. We're currently working on a fix, and should be back to normal soon.
— Twitter Support (@TwitterSupport) October 2, 2019

The news first broke early this morning, with outages affecting Twitter and TweetDeck. Users report to experiencing problems trying to tweet, getting notifications, and sending DMs. According to Twitter's API Status website, the issue is being investigated:

Investigating - As of 2019-10-02 06:35:00 UTC, The Twitter data team is investigating a system irregularity causing lowered success rates across all APIs. We will provide an update as soon as we know more. Oct 2, 07:33 UTC

Monitoring - As of 05:00:00, Oct 2 UTC - All APIs/products should be operating normally Oct 2, 05:14 UTC

Update - The Twitter data team is investigating a system irregularity affecting all products/APIs that occurred starting on October 2 at approximately 00:50 UTC. Data may be delayed or missing at this time. We will provide an update as soon as we know more. Oct 2, 02:55 UTC

Investigating - The Twitter data team is investigating a system irregularity affecting the streaming APIs that occurred starting on October 2 at approximately 00:50 UTC. Data may be delayed this time. We will provide an update as soon as we know more. Oct 2, 01:29 UTC

It seems the issue was resolved for a time, but has now resurfaced. Below is a full list of Twitter's services and how they are affected: